https://docs.google.com/forms/d/e/1FAIpQLSd09vSk937tWxhLYIMNQAe3tePtNQt4CySPGHc232R9Asx5GA/viewform?usp=header
If you prefer to raise concerns with someone else, you can contact the NDIS Quality and Safeguards Commission:
Complaints can be made anonymously.